package pers.study.datastructure.stack;


import pers.study.datastructure.array.Array;

/**
 * @author rookie
 * @date 2020/4/7
 */
public class ArrayStack<E> implements Stack<E>{
    Array<E> array;
    public ArrayStack(){
        array = new Array<>();
    }
    public ArrayStack(int capacity){
        array = new Array<>(capacity);
    }
    @Override
    public int getSize() {
        return array.getSize();
    }

    @Override
    public boolean isEmpty() {
        return array.isEmpty();
    }

    @Override
    public void push(E e) {
        array.addLast(e);
    }

    @Override
    public E pop() {
        return array.removeLast();
    }

    @Override
    public E peek() {
        return array.getLast();
    }

    @Override
    public String toString(){
        StringBuilder res = new StringBuilder();
        res.append("stack : ");
        res.append('[');
        for (int i = 0; i < array.getSize(); i++) {
            res.append(array.get(i));
            if(i != array.getSize() - 1){
                res.append(",");
            }
        }
        res.append("] top ");
        return res.toString();
    }

    public  int getCapacity(){
        return array.getCapacity();
    }

}
